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Short-Term Investments (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Short-Term Investments | The following table summarizes the Company’s short-term investments (in thousands):
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
As of December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 1,603 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,603 |
State, municipal and local government agencies bonds |  |  | 59,009 |  |  |  | 45 |  |  |  | (4 | ) |  |  | 59,050 |
Corporate bonds |  |  | 31,568 |  |  |  | 4 |  |  |  | (10 | ) |  |  | 31,562 |
Commercial paper |  |  | 10,287 |  |  |  | 1 |  |  |  | — |  |  |  | 10,288 |
U.S. federal government bonds |  |  | 2,003 |  |  |  | — |  |  |  | — |  |  |  | 2,003 |
Total short-term investments |  | $ | 104,470 |  |  | $ | 50 |  |  | $ | (14 | ) |  | $ | 104,506 |
As of December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State, municipal and local government agencies bonds |  | $ | 38,785 |  |  | $ | 46 |  |  | $ | (6 | ) |  | $ | 38,825 |
Corporate bonds |  |  | 18,613 |  |  |  | 6 |  |  |  | (15 | ) |  |  | 18,604 |
Commercial paper |  |  | 4,195 |  |  |  | — |  |  |  | — |  |  |  | 4,195 |
U.S. federal government bonds |  |  | 9,226 |  |  |  | 4 |  |  |  | — |  |  |  | 9,230 |
Total short-term investments |  | $ | 70,819 |  |  | $ | 56 |  |  | $ | (21 | ) |  | $ | 70,854 |
Maturities of Short-Term Investments | The following table summarizes the maturities of the Company’s short-term investments (in thousands):
|  | December 31, |
|  | 2012 |  |  | 2011 |
Less than one year |  | $ | 76,779 |  |  | $ | 43,470 |
Due in 1 - 2 years |  |  | 27,727 |  |  |  | 27,384 |
Total short-term investments |  | $ | 104,506 |  |  | $ | 70,854 |

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